Do you want to use Scheme in a Javascript program? No problem. Download this: interpreter.js.
Advantages
It works
It is light
It is easy to use and to customize
Drawback
No yet finished: no call/cc, no let*, no letrec

1. Add <script src="interpreter.js" type="text/javascript"></script> to your html file.

2. Use it as follows:
scheme.eval("(+ 1 2)");